Affiliation: | 1. Department of Organic Chemistry, Faculty of Science, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon;2. Department of Chemistry, Higher Teachers'' Training College, University of Yaounde 1, ENS, BP 47, Yaounde, Cameroon;3. Department of Chemistry, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany;4. Department of Chemistry, University of the Western Cape, P/Bag X17, Bellville 7530, South Africa |